Yes, along with argumentation also evidence should be supplied.

Moreover, perhaps we need a definition of scam here in crypto. I would say there are 2 categories: Fraud (team takes money and runs) and incapacity (team keeps promising, but it is clear they cannot deliver/are fighting and are only wasting money&time).

For instance, an example of fraud would be PayCoin. An example of incapacity are current events at Tezos.

What do you think?